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  • 1
    Electronic Resource
    Electronic Resource
    Magnetic properties of R(Fe,Mn)11Ti compounds : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 6324-6326 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: High-field magnetization measurements have been performed on both free-powder samples and magnetically aligned samples of R(Fe,Mn)11Ti (R=Y, Nd, Sm, Gd, Er) compounds at 4.2 K in a step field up to 28 T. The temperature dependence of ac susceptibilities of R(Fe,Mn)11Ti has been measured in a temperature range from 4.2 to 800 K. It has been found that both the magnetic moment of the transition-metal sublattice and the Curie temperature of RFe11−xMnxTi compounds decrease with increasing x. Spin reorientations occur in ErFe11−xMnxTi compounds as the result of competition between the uniaxial anisotropy of the transition-metal sublattice and the planar or conical anisotropy of the Er sublattice. The intersublattice exchange constants nRT of ErFe11−xMnxTi compounds have been deduced by the high-field free-powder method. The effect of the substitution of Fe by Mn on the magnetic anisotropies of R(Fe,Mn)11Ti with R=Y, Nd, Sm has been investigated. First-order magnetization processes take place in SmFe11−xMnxTi compounds when the external field is applied perpendicular to the alignment direction. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.361987
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  • 2
    Electronic Resource
    Electronic Resource
    Possible ferrimagnetic coupling in light-rare-earth transition-metal intermetallic compounds : 38th Annual Conference on Magnetism and Magnetic Materials (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 7117-7119 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The possibility of ferrimagnetic coupling between the magnetic moments of the light-rare-earth (Nd, Pr) ions and of the transition-metal (Fe) ions in Nd6Ga3Fe11- and Pr6Ga3Fe11-based compounds is deduced from the high-field magnetization curves measured at 4.2 K on magnetically aligned and on free-powder samples and from the temperature dependence of the magnetization. The ferrimagnetic coupling is very weak: at 4.2 K, the rare-earth moments and the transition-metal moments can be forced to ferromagnetic alignment by application of an external magnetic field of about 4 T. Generally, in intermetallic compounds, the magnetic coupling is ferromagnetic between light-rare-earth and transition-metal ions and ferrimagnetic between heavy-rare-earth and transition-metal ions. The present results suggest that in some crystal structures ferrimagnetic coupling also may exist in the compounds formed by light-rare-earth and transition-metal elements.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.356697
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  • 3
    Electronic Resource
    Electronic Resource
    Magnetic properties of YCo4B-based compounds : 37th Annual conference on magnetism and magnetic materials (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 5920-5922 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The magnetic properties of YCo4B-based compounds have been investigated. The Curie temperature TC of YCo4B does not change upon substitution of 20% of the Y ions by Nd or 20% of the B ions by C. TC increases significantly upon substitution of Fe for Co. The Co moment in YCo4B0.8C0.2 is nearly equal to that in YCo4B.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.353521
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  • 4
    Electronic Resource
    Electronic Resource
    Microstructure and magnetostriction for (Dy0.65Tb0.25Pr0.1) (Fe1−xAlx)1.8 alloys (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 2587-2589 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The microstructure, Curie temperature and magnetostriction of R(Fe1−xAlx)1.8 alloys (R=Dy0.65Tb0.25Pr0.1, x≤0.3) have been investigated using optical microscopy, x-ray diffraction, transmission electron microscopy, electron probe microanalysis, positron annihilation technique, vibrating sample magnetometer, and standard strain gauge technique. It was found that the alloys are essentially single phase up to x=0.30. The defects in R(Fe1−xAlx)1.8 decrease with increasing Al content when x≤0.1. The magnetostriction of the alloys decreases with increasing Al content in high applied magnetic fields, but it exhibits a peak when x=0.05 in low applied magnetic fields (H≤160 k A/m). © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.361126
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  • 5
    Electronic Resource
    Electronic Resource
    Mechanism of texture formation during heat-treatment process in Ag-sheathed Bi-2223 tapes (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 8112-8114 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The texture formation and development of Bi-based superconducting phases during the heat-treatment process are carefully investigated. With increasing anneal time, the (001) texture of both 2212 and 2223 phases is enhanced. The reduction of the interfacial energy due to a Bi2O2 layer in the cell is the main factor contributing to the texture formation. The texture of the parent phase and the interface parallel to the (001) plane are beneficial factors. The effects of sheathed Ag, second phases, and voids on the texture formation are studied. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.362369
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  • 6
    Electronic Resource
    Electronic Resource
    Magnetic properties of R2Co14(B,C) compounds (R=Y, Sm) : 37th Annual conference on magnetism and magnetic materials (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 5875-5877 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The magnetic properties of R2Co14B1−xCx (x=0, 0.5 and R=Y, Sm) compounds have been studied by measuring the temperature dependence of the easy- and hard-magnetization curves on magnetically aligned samples between 1.5 and 300 K for Y2Co14(B,C) and at 4.2 K for Sm2Co14(B,C). The magnetic anisotropy of Y2Co14B increases due to the substitution of C for B, whereas the saturation magnetization decreases. Between 1.5 and 300 K, the anisotropy field of Y2Co14B0.5C0.5 increases about 2 T and the Co moment decreases about 0.05μB. The anisotropy field of Sm2Co14B also increases upon C substitution and the saturation magnetization decreases slightly. The ac susceptibilities of both Sm2Co14B and Sm2Co14B0.5C0.5 exhibit anomalies that may arise from a spin reorientation within the basal plane.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.353507
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  • 7
    Electronic Resource
    Electronic Resource
    Analysis of a magnetization process based on a two sublattice model (1992)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 71 (1992), S. 3434-3438 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A computer simulation program, based on a two sublattice model, is performed to analyze the magnetization process of ferromagnetic materials (like, for instance, RCo5 and R2Fe14B compounds). Without using the assumption of the existence of a small canting angle between the two sublattices, as has been used in the analysis of S. Rinaldi and L. Pareti [J. Appl. Phys. 50, 7719 (1979)], the magnetization curve as well as its derivative curves are studied for the two sublattice system with high competing single-ion anisotropies. In the present work, a peak in the low field range of the second curve of magnetization is reported and the magnetic process is correspondingly discussed in terms of both the exchange energy and the anisotropy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.350942
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  • 8
    Electronic Resource
    Electronic Resource
    First order magnetization process in (Nd,Pr)2Co14B compounds : 35th annual conference on magnetism and magnetic materials (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 5548-5550 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: High-field magnetization behavior of (Nd,Pr)2Co14B compounds at T=4.2 K has been studied through applying high fields up to 35 T. Taking the misalignment of grains in the samples into account, the anisotropy constants K1, K2, and K3 were determined by means of fitting the hard magnetization curves. Within the framework of the theory developed by Asti and Bolzoni, FOMP phenomena are predicted to occur in the whole system (0〈x〈1). Accompanying the transformation from easy cone (x=0) to easy axis (x(approximately-greater-than)0.2), the type of FOMP changes from P1C to P1. The critical field of the FOMP transition increases with increasing Pr content. Magnetic measurements show that a valence instability of the Pr ion may exist.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.347946
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  • 9
    Electronic Resource
    Electronic Resource
    Magnetic properties of the Y2Fe14B0.5C0.5 compound : 35th annual conference on magnetism and magnetic materials (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 5574-5576 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Y2Fe14B0.5C0.5 has the same tetragonal structure as Y2Fe14B with space group P42/mnm. Magnetic properties of the Y2Fe14B0.5C0.5 compound have been studied using an extraction magnetometer with a maximum field of 6 T, in the temperature range from 1.5 to 300 K. By means of fitting the hard magnetization curves, the magnetocrystalline anisotropy constants K1, K2, and K3 were determined. It was found that although the magnetocrystalline anisotropy field (μ0Ha) increases abnormally with increasing temperature as in the case of Y2Fe14B, the dependence of anisotropy constants on temperature is quite different from that of Y2Fe14B. K1 and K3 decrease slightly with increasing temperature. K2 increases abnormally with increasing temperature, which contributes to the abnormal dependence of anisotropy field on temperature. In addition, the substitution of carbon for boron leads to a reduction of 3d-3d interaction and spontaneous magnetization. In contrast, uniaxial anisotropy is increased by the addition of carbon below room temperature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.347954
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  • 10
    Electronic Resource
    Electronic Resource
    Mössbauer spectra study of Nd2Fe14−xGaxB and Nd2Fe11.5−xCo2.5GaxB compounds (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 68 (1990), S. 4208-4213 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A Mössbauer study of Nd2Fe14−xGaxB and Nd2Fe11.5−xCo2.5GaxB confirmed that, in Nd2Fe14−xGaxB with x〈1, preferential occupation of the k2 site by Ga atoms occurs, and that when x≥1, Ga atoms preferentially occupy the k1 as well as j1 sites in addition to the k2 sites. In Nd2Fe11.5−xCo2.5GaxB, the Ga atoms preferentially occupy the j2 site, and also appear at the j1 sites when x≥1. Based on these findings, the different effect of Ga on the Curie temperature in these two compound series can be interpreted satisfactorily. The fact that in these compound series the a axis is little changed whereas the c axis remarkably increases with increasing Ga substitution can also be explained.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.346210
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